辽中凹陷南洼旅大21油田油气成藏条件及分布特征
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摘要
综合录井、测井、地震、取心及分析化验资料,从烃源岩与油源条件、储盖组合特征、圈闭发育特征、油气运移及保存条件5个方面对辽中凹陷南洼旅大21油田的油气成藏条件进行系统剖析。研究结果表明,旅大21油田的原油主要来自沙三段烃源岩,且混入部分沙一段烃源岩的原油;储层以馆陶组辫状河碎屑岩为主,生储盖组合为下生中储上盖式;圈闭类型受控于中央走滑断层,西盘为半背斜构造,东盘为复杂断块构造;长期继承性发育的断层在新构造运动时期的活化为旅大21油田创造了良好的油气运移条件,不同断块控圈断层的封堵能力具有差异性。油气藏平面上主要分布于走滑反转作用形成的西盘半背斜构造及东盘似花状构造,纵向上油气主要富集于馆陶组区域泥岩盖层下伏的馆陶组Ⅳ和Ⅴ油组,且具有单井揭示油层厚度大、连续含油井段长、油层分布集中的特点,走滑反转-区域盖层-断层侧封三元耦合对旅大21油田平面和垂向上的油气聚集具有控制作用。
The hydrocarbon accumulation conditions in LD21 Oilfield were analyzed,using mud logging,well logging,coring and core analysis test data from five aspects,including the source rocks and oil source conditions,reservoir-seal assemblage,trap characteristics,oil and gas migration and preservation condition. The results show that the crude oil in LD21 Oilfield are mainly from the source rocks of the third member of Shahejie Formation and part of them from the source rocks of the first member of Shahejie Formation. The main reservoirs are the clastic rocks deposited in the braided river in the Guantao Formation. The style of source-reservoir-seal assemblage is source at the bottom,reservoir at the middle and seal at the top. Being controlled by central strike-slip fault,the trap in the west plate is a semi-anticline structure,and in the east plate is a complex fault block structure. The long activation of the inherited faults in the Neotectonic movement creates good conditions for oil and gas migration in LD21 Oilfield. The sealing capacity of faults in the fault-controlled traps of different fault blocks is different. The oil and gas reservoirs are mainly distributed in the semi-anticline structure of west plate and the flower-like structure of east plate,which is formed under the influence of strike-slip reversal in plane. In the longitudinal direction,the oil and gas are mainly concentrated in the ⅣandⅤoil groups under the mudstone cap rock of the Guantao Formation,and the oil reservoirs discovered by single well are characterized by large thickness,long length oilbearing-sections and concentrated distribution of oil layers. Finally,the oil and gas accumulation of the LD21 Oilfield in the plane and vertical is controlled by the coupling of three elements,which are strike-slip reversal,regional cap and lateral sealing of fault.
The hydrocarbon accumulation conditions in LD21 Oilfield were analyzed,using mud logging,well logging,coring and core analysis test data from five aspects,including the source rocks and oil source conditions,reservoir-seal assemblage,trap characteristics,oil and gas migration and preservation condition. The results show that the crude oil in LD21 Oilfield are mainly from the source rocks of the third member of Shahejie Formation and part of them from the source rocks of the first member of Shahejie Formation. The main reservoirs are the clastic rocks deposited in the braided river in the Guantao Formation. The style of source-reservoir-seal assemblage is source at the bottom,reservoir at the middle and seal at the top. Being controlled by central strike-slip fault,the trap in the west plate is a semi-anticline structure,and in the east plate is a complex fault block structure. The long activation of the inherited faults in the Neotectonic movement creates good conditions for oil and gas migration in LD21 Oilfield. The sealing capacity of faults in the fault-controlled traps of different fault blocks is different. The oil and gas reservoirs are mainly distributed in the semi-anticline structure of west plate and the flower-like structure of east plate,which is formed under the influence of strike-slip reversal in plane. In the longitudinal direction,the oil and gas are mainly concentrated in the ⅣandⅤoil groups under the mudstone cap rock of the Guantao Formation,and the oil reservoirs discovered by single well are characterized by large thickness,long length oilbearing-sections and concentrated distribution of oil layers. Finally,the oil and gas accumulation of the LD21 Oilfield in the plane and vertical is controlled by the coupling of three elements,which are strike-slip reversal,regional cap and lateral sealing of fault.
引文
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[2]彭靖淞,徐长贵,吴奎,等.郯庐断裂带辽东凸起的形成与古辽中洼陷的瓦解[J].石油学报,2015,36(3):274-285.PENG Jingsong,XU Changgui,WU Kui,et al.Formation of Liaodong uplift and collapse of the ancient Liaozhong sag in Tan-Lu fault zone[J].Acta Petrolei Sinica,2015,36(3):274-285.
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[4]刘丰,吴奎,王冰洁,等.辽东湾坳陷辽中南洼旅大16油田原油特征差异与成藏过程[J].大庆石油地质与开发,2017,36(1):1-9.LIU Feng,WU Kui,WANG Bingjie,et al.Differences of the crude oil characteristics and hydrocarbon accumulation process for Oilfield Luda16 in South Liaozhong Sag of Liaodong Bay Depression[J].Petroleum Geology&Oilfield Development in Daqing,2017,36(1):1-9.
[5]汤良杰,陈绪云,周心怀,等.渤海海域郯庐断裂带构造解析[J].西南石油大学学报:自然科学版,2011,33(1):170-176.TANG Liangjie,CHEN Xuyun,ZHOU Xinhuai,et al.Structural analysis of Tan-Lu fault zone in the Bohai Sea[J].Journal of Southwest Petroleum University:Science&Technology Edition,2011,33(1):170-176.
[6]周心怀,余一欣,汤良杰,等.渤海海域新生代盆地结构与构造单元划分[J].中国海上油气,2010,22(5):285-289.ZHOU Xinhuai,YU Yixin,TANG Liangjie,et al.Cenozoic offshore basin architecture and division of structural elements in Bohai sea[J].China Offshore Oil and Gas,2010,22(5):285-289.
[7]邓运华,徐长贵,李建平.渤海大油田形成条件探讨[J].中国工程科学,2011,13(5):10-15.DENG Yunhua,XU Changgui,LI Jianping,et al.Discussion on the forming conditions of Bohai Oilfield[J].Engineering Sciences,2011,13(5):10-15.
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[9]刘泽荣,信荃麟,邓俊国.断块群油气藏形成机制和构造模式[M].北京:石油工业出版社,1998.LIU Zerong,XIN Quanlin,DENG Junguo.Formation mechanism and tectonic model of oil and gas reservoirs in fault block group[M].Beijing:Petroleum Industry Press,1998.
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